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Finding the Fourth Proportional to 18,698.60, 28,047.90 and 15,415.40

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Solution

The fourth proportional to 18,698.60, 28,047.90 and 15,415.40 is: 23,123.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.60 : 28,047.90 = 15,415.40 : x
  2. Step 2: Convert to fraction form
    18,698.60/28,047.90 = 15,415.40/x
  3. Step 3: Cross multiply
    18,698.60x = 28,047.90 × 15,415.40
  4. Step 4: Simplify right side
    18,698.60x = 432,369,597.66
  5. Step 5: Solve for x
    x = 432,369,597.66/18,698.60
  6. Step 6: Final answer
    x = 23,123.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.